918381919 has 32 divisors (see below), whose sum is σ = 1167344640. Its totient is φ = 703123200.

The previous prime is 918381907. The next prime is 918381923. The reversal of 918381919 is 919183819.

It is a happy number.

It is not a de Polignac number, because 918381919 - 2²¹ = 916284767 is a prime.

It is a super-2 number, since 2×918381919² = 1686850698292245122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918381949) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 487822 + ... + 489700.

It is an arithmetic number, because the mean of its divisors is an integer number (36479520).

Almost surely, 2^918381919 is an apocalyptic number.

918381919 is a deficient number, since it is larger than the sum of its proper divisors (248962721).

918381919 is a wasteful number, since it uses less digits than its factorization.

918381919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071.

The product of its digits is 139968, while the sum is 49.

The square root of 918381919 is about 30304.8167623564. The cubic root of 918381919 is about 972.0183004875.

The spelling of 918381919 in words is "nine hundred eighteen million, three hundred eighty-one thousand, nine hundred nineteen".